本文關(guān)鍵詞： 靈活光網(wǎng)絡(luò) 格式變換 路由與資源分配 多路徑保護(hù) 資源共享 網(wǎng)絡(luò)規(guī)劃與優(yōu)化　出處：《北京郵電大學(xué)》2014年博士論文　論文類型：學(xué)位論文

【摘要】：隨著互聯(lián)網(wǎng)技術(shù)的快速發(fā)展,業(yè)務(wù)速率越來越大,粒度越來越多樣化,使用ITU標(biāo)準(zhǔn)固定柵格的傳統(tǒng)波分復(fù)用網(wǎng)絡(luò)逐漸不能滿足日益增長的業(yè)務(wù)需求。具有彈性光通道的靈活光波分復(fù)用網(wǎng)絡(luò)使用彈性光通道能夠一定程度解決這些問題。與傳統(tǒng)固定柵格光網(wǎng)絡(luò)相比,靈活光網(wǎng)絡(luò)中的路由與資源分配問題更加復(fù)雜。傳統(tǒng)的路由與波長分配方法已無法完全解決靈活光網(wǎng)絡(luò)的資源優(yōu)化問題。本文針對(duì)靈活光網(wǎng)絡(luò)中的資源優(yōu)化問題,研究了考慮中間節(jié)點(diǎn)調(diào)制格式變換的路由與資源分配策略、多路徑傳輸抗多故障資源優(yōu)化策略、資源共享與多路徑結(jié)合抗多故障策略等三個(gè)方面的相關(guān)技術(shù)。 靈活光網(wǎng)絡(luò)有效地提高了網(wǎng)絡(luò)頻譜利用效率,為未來網(wǎng)絡(luò)架構(gòu)開辟了新的前景。但頻譜碎片及其導(dǎo)致的阻塞仍是靈活光網(wǎng)絡(luò)中的瓶頸。本文提出了在中間節(jié)點(diǎn)進(jìn)行調(diào)制格式變換的策略,該策略在中間節(jié)點(diǎn)設(shè)置共享的調(diào)制格式變換模塊,通過動(dòng)態(tài)路由、調(diào)制格式與頻譜分配算法實(shí)現(xiàn)靈活光網(wǎng)絡(luò)的資源優(yōu)化。仿真結(jié)果表明,該策略可在不增加額外的帶寬或改變現(xiàn)有業(yè)務(wù)的前提下,使得靈活光網(wǎng)絡(luò)頻譜利用效率提高了5%,阻塞率降低20%。在生存場景下,所提策略能夠有效地提高業(yè)務(wù)故障恢復(fù)率,改善網(wǎng)絡(luò)生存性。 面對(duì)自然災(zāi)害等大規(guī)模故障的頻發(fā),光網(wǎng)絡(luò)的抗多故障生存性已經(jīng)成為一個(gè)研究熱點(diǎn)。本文從靈活光網(wǎng)絡(luò)中的抗多故障資源優(yōu)化入手,引入多路徑傳輸機(jī)制,對(duì)靈活光網(wǎng)絡(luò)中的多路徑傳輸策略進(jìn)行了研究與分析。通過對(duì)其所需帶寬進(jìn)行數(shù)值計(jì)算,定量分析了其在抗多故障保護(hù)中與單路徑傳輸相比的優(yōu)勢。建立了靈活光網(wǎng)絡(luò)中的多路徑傳輸整形線性規(guī)劃(ILP)模型,并對(duì)模型進(jìn)行了求解分析。仿真結(jié)果證明所提出的靈活光網(wǎng)絡(luò)中抗多故障的多路徑傳輸資源優(yōu)化策略節(jié)約了網(wǎng)絡(luò)資源,在保證傳輸性能的同時(shí)有效提高網(wǎng)絡(luò)資源效率。 靈活光網(wǎng)絡(luò)中的資源共享已被證明能夠有效地提高網(wǎng)絡(luò)的資源效率。靈活光網(wǎng)絡(luò)中的資源共享不僅是對(duì)波長或子波長等固定帶寬資源,而是更靈活的頻譜資源共享。本文針對(duì)靈活光網(wǎng)絡(luò)中考慮資源共享的多路徑抗多故障資源優(yōu)化問題進(jìn)行了研究,提出了充分考慮靈活光網(wǎng)絡(luò)特點(diǎn)、多路徑傳輸和資源共享優(yōu)勢的資源優(yōu)化策略,并設(shè)計(jì)了基于改進(jìn)的遺傳算法來實(shí)現(xiàn)所提策略。算法通過對(duì)業(yè)務(wù)資源分配排序進(jìn)行編碼,使用兩點(diǎn)交叉與賭盤算法,并進(jìn)行有效的變異操作。仿真結(jié)果顯示所提出的策略與算法能夠有效提高網(wǎng)絡(luò)資源效率,實(shí)現(xiàn)資源優(yōu)化。
[Abstract]:With the rapid development of Internet technology, the business rate is increasing and the granularity is becoming more and more diversified. The traditional wavelength division multiplexing network using ITU standard fixed grid can not meet the increasing service demand gradually. Flexible optical wavelength division multiplexing network with elastic optical channel can solve these problems to a certain extent. Compared with traditional fixed grid optical network. The problem of routing and resource allocation in flexible optical networks is more complicated. The traditional routing and wavelength assignment methods can not completely solve the problem of resource optimization in flexible optical networks. This paper aims at the problem of resource optimization in flexible optical networks. . The related technologies of routing and resource allocation considering modulation format transformation of intermediate nodes, multi-path transmission anti-multi-fault resource optimization strategy, resource sharing and multi-path combination anti-multi-fault strategy are studied. Flexible optical network improves the efficiency of spectrum utilization effectively. It opens up a new prospect for the future network architecture. However, spectrum fragmentation and its resulting blocking are still the bottleneck in flexible optical networks. This paper proposes a strategy of modulation format transformation in intermediate nodes. A shared modulation format transform module is set in the middle node of the strategy. The dynamic routing, modulation format and spectrum allocation algorithm are used to optimize the resource of flexible optical network. The simulation results show that. Without adding additional bandwidth or changing existing services, this strategy can improve the spectral efficiency of flexible optical networks by 5% and reduce the blocking rate by 20%. The proposed strategy can effectively improve the service recovery rate and network survivability. In the face of the frequent occurrence of large-scale faults such as natural disasters, the survivability of optical networks has become a research hotspot. This paper starts with the optimization of anti-multi-fault resources in flexible optical networks, and introduces a multi-path transmission mechanism. The multipath transmission strategy in flexible optical networks is studied and analyzed, and the required bandwidth is calculated numerically. Compared with single path transmission, the advantages of ILP in multipath protection are quantitatively analyzed, and the ILP model of multipath transmission shaping linear programming in flexible optical network is established. The simulation results show that the multi-path transmission resource optimization strategy against multi-fault in flexible optical networks saves network resources. The network resource efficiency is improved effectively while ensuring the transmission performance. Resource sharing in flexible optical networks has been proved to be effective in improving resource efficiency. Resource sharing in flexible optical networks is not only fixed bandwidth resources such as wavelength or sub-wavelength. In this paper, the problem of multi-path anti-multi-fault resource optimization considering resource sharing in flexible optical networks is studied, and the characteristics of flexible optical networks are fully taken into account. Multi-path transmission and resource sharing advantages of the resource optimization strategy, and designed based on the improved genetic algorithm to achieve the proposed strategy. Using the algorithm of two points crossing and gambling, and carrying on the effective mutation operation, the simulation results show that the proposed strategy and algorithm can effectively improve the efficiency of network resources and realize resource optimization.
【學(xué)位授予單位】：北京郵電大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN929.1

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